Structure of the tsunamigenic plate boundary and low-frequency earthquakes in the southern Ryukyu Trench

被引：44

作者：

Arai, Ryuta ^{[1
]}

Takahashi, Tsutomu ^{[1
]}

Kodaira, Shuichi ^{[1
]}

Kaiho, Yuka ^{[1
]}

Nakanishi, Ayako ^{[1
]}

Fujie, Gou ^{[1
]}

Nakamura, Yasuyuki ^{[1
]}

Yamamoto, Yojiro ^{[1
]}

Ishihara, Yasushi ^{[1
]}

Miura, Seiichi ^{[1
]}

Kaneda, Yoshiyuki ^{[2
]}

机构：

[1] Japan Agcy Marine Earth Sci & Technol, Res & Dev Ctr Earthquake & Tsunami, Kanazawa Ku, 3173-25 Showa Machi, Yokohama, Kanagawa 2360001, Japan

[2] Kagawa Univ, Inst Educ Res & Reg Cooperat Crisis Management Sh, 1-1 Saiwai Cho, Takamatsu, Kagawa 7608521, Japan

来源：

NATURE COMMUNICATIONS | 2016年 / 7卷

关键词：

SUBDUCTION ZONE; SLOW EARTHQUAKES; JAPAN; SLIP; DEFORMATION; RELEASE; TREMOR; OCCUR;

D O I：

10.1038/ncomms12255

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

It has been recognized that even weakly coupled subduction zones may cause large interplate earthquakes leading to destructive tsunamis. The Ryukyu Trench is one of the best fields to study this phenomenon, since various slow earthquakes and tsunamis have occurred; yet the fault structure and seismic activity there are poorly constrained. Here we present seismological evidence from marine observation for megathrust faults and low-frequency earthquakes (LFEs). On the basis of passive observation we find LFEs occur at 15-18 km depths along the plate interface and their distribution seems to bridge the gap between the shallow tsunamigenic zone and the deep slow slip region. This suggests that the southern Ryukyu Trench is dominated by slow earthquakes at any depths and lacks a typical locked zone. The plate interface is overlaid by a low-velocity wedge and is accompanied by polarity reversals of seismic reflections, indicating fluids exist at various depths along the plate interface.

引用

页数：7

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